I created a new user on Kopano with two calendar events (October 3 and November 13).
After that I created an exchange account on my phone and here are the results of syncing (folderid for the calender is Ud4d68):
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] -------- Start
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] cmd='Sync' devType='Android' devId='androidc259103399' getUser='test' from='91.16.124.153' version='2.4.4+0-0' method='POST'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Used timezone 'Europe/Amsterdam'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::GetBackend(): trying autoload backend 'BackendKopano'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] BackendKopano using PHP-MAPI version: 8.6.2 - PHP version: 7.0.27-0+deb9u1
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Request::ProcessHeaders() ASVersion: 14.1
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::CommandNeedsProvisioning(0): true
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->GetState() read '20712' bytes from file: '/var/lib/z-push/9/9/androidc259103399-devicedata'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ASDevice data loaded for user: 'test'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] TopCollector(): Initialized mutexid Resource id #18 and memid Resource id #19.
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] TopCollector initialised with IPC provider 'IpcSharedMemoryProvider' with type '20'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] LoopDetection(): Initialized mutexid Resource id #22 and memid Resource id #23.
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] LoopDetection initialised with IPC provider 'IpcSharedMemoryProvider' with type '1337'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::HierarchyCommand(0): false
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->ProvisioningRequired('442565253') saved device key '442565253': false
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->getPolicyName(): determined policy name: 'default'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->getProvisioningPolicies(): loaded 'default' policy.
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::CommandNeedsAuthentication(0): true
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] KopanoBackend->Logon(): Trying to authenticate user 'test'..
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] KopanoBackend->openMessageStore('test'): Found 'DEFAULT' store: 'Resource id #34'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] KopanoBackend->Logon(): User 'test' is authenticated
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Store supports properties containing Unicode characters.
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::CommandNeedsPlainInput(0): false
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <Synchronize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <Folders>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <Folder>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <SyncKey>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I {2a546d96-7c8b-4a15-9df5-090f9b7ae460}1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </SyncKey>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <FolderId>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I Ud4d68
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </FolderId>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->GetState() read '737' bytes from file: '/var/lib/z-push/9/9/androidc259103399-2a546d96-7c8b-4a15-9df5-090f9b7ae460-fd'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncParameters->UseCPO('DEFAULT')
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->GetBackendIdForFolderId(): folderid Ud4d68 => d3cebb4b355848d589969ff20440b6ee7b4100000000
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncCollections->AddCollection(): Folder id 'Ud4d68' : ref. PolicyKey '442565253', ref. Lifetime '', last sync at '1542110419'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncCollections->AddCollection(): Updated reference PolicyKey '442565253', reference Lifetime '', Last sync at '1542110419'
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <DeletesAsMoves/>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <GetChanges/>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <WindowSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I 10
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </WindowSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <Options>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <FilterType>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncParameters->UseCPO('DEFAULT')
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I 4
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </FilterType>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <AirSyncBase:BodyPreference>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <AirSyncBase:Type>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I 1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </AirSyncBase:Type>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I <AirSyncBase:TruncationSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I 200000
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </AirSyncBase:TruncationSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </AirSyncBase:BodyPreference>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </Options>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </Folder>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] HandleSync(): FilterType has changed (old: '', new: '4'), removing folderstat to force Exporter setup
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </Folders>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] I </Synchronize>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] HandleSync(): Start Output
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::GetAdditionalSyncFolderStore('d3cebb4b355848d589969ff20440b6ee7b4100000000'): 'false'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] KopanoBackend->GetFolderStat() fetched status information of 24 folders for store 'test'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncParameters->IsExporterRunRequired(): true - current: 1542110319/2/0/0 - saved: false - expiring: not set
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Sync->loadStates(): loading states for folder 'Ud4d68'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->GetState() read '15' bytes from file: '/var/lib/z-push/9/9/androidc259103399-2a546d96-7c8b-4a15-9df5-090f9b7ae460-1'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::GetAdditionalSyncFolderStore('d3cebb4b355848d589969ff20440b6ee7b4100000000'): 'false'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::GetAdditionalSyncFolderStore('d3cebb4b355848d589969ff20440b6ee7b4100000000'): 'false'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ExportChangesICS->Config(): synching inital data
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ExportChangesICS->Config() initialized with state: 0xef00000000000000
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ExportChangesICS->InitializeExporter() successfully. 1 changes ready to sync for 'd3cebb4b355848d589969ff20440b6ee7b4100000000'.
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] LoopDetection->ProcessLoopDetectionAddStatus: 'Ud4d68' with status 1
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] WBXMLEncoder->startWBXML() type: vnd.ms-sync.wbxml
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Folder type: Calendar
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Synchronize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Folders>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Folder>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <SyncKey>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O {2a546d96-7c8b-4a15-9df5-090f9b7ae460}2
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </SyncKey>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <FolderId>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O Ud4d68
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </FolderId>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Status>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Status>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] LoopDetection->Detect(): folderid:'Ud4d68' uuid:'2a546d96-7c8b-4a15-9df5-090f9b7ae460' counter:'1' max:'10' queued:'1'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] PHPWrapper->ImportMessageChange(): Getting message from MAPIProvider, sourcekey: 'd3cebb4b355848d589969ff20440b6ee8e4100000000', parentsourcekey: 'd3cebb4b355848d589969ff20440b6ee7b4100000000', entryid: '000000007e9b0aefe8e241eaaeb1c9f1257048db01000000050000004ea9547896fd4cb8aa4f1c6bbde563e400000000'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] BodyPreference types: 1
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] GetBodyPreferenceBestMatch: 1
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] bpo: truncation size:'200000', allornone:'0', preview:'0'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] MAPIStreamWrapper::stream_open(): initialized mapistream: Resource id #119 - streamlength: 0 - HTML-safe-truncate: false
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] TimezoneUtil::GetFullTZ() for Europe/Amsterdam
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] MAPIProvider->getAppointment(): setting ourself as the organizer for an appointment without attendees.
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Perform>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Add>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <ServerEntryId>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O Ud4d68:d3cebb4b355848d589969ff20440b6ee8e4100000000
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </ServerEntryId>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <Data>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:DtStamp>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 20181113T115839Z
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:DtStamp>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:StartTime>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 20181112T230000Z
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:StartTime>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:Subject>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O test
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:Subject>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:UID>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O d3cebb4b355848d589969ff20440b6ee8e4100000000
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:UID>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:OrganizerName>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O Max Mustermann
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:OrganizerName>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:OrganizerEmail>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O test@sowei.de
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:OrganizerEmail>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:EndTime>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 20181113T230000Z
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:EndTime>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:Sensitivity>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 0
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:Sensitivity>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:BusyStatus>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 0
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:BusyStatus>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:AllDayEvent>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:AllDayEvent>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:Reminder>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 1080
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:Reminder>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <POOMCAL:MeetingStatus>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 0
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </POOMCAL:MeetingStatus>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <AirSyncBase:Body>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <AirSyncBase:Type>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </AirSyncBase:Type>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <AirSyncBase:EstimatedDataSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 0
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </AirSyncBase:EstimatedDataSize>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <AirSyncBase:Data>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <<< written 0 of 0 bytes of plain data >>>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </AirSyncBase:Data>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </AirSyncBase:Body>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O <AirSyncBase:NativeBodyType>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O 1
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </AirSyncBase:NativeBodyType>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Data>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Add>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] PHPWrapper->ImportMessageChange(): change for: 'Ud4d68:d3cebb4b355848d589969ff20440b6ee8e4100000000'
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Perform>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SetFolderSyncStatus(): completed for Ud4d68
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] ZPush::GetAdditionalSyncFolderStore('d3cebb4b355848d589969ff20440b6ee7b4100000000'): 'false'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] Sync()->setFolderStat() on Ud4d68: 1542110319/2/0/0 expiring 2018-11-27 07:19:37
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Folder>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->SetState() written 1 bytes on file: '/var/lib/z-push/9/9/androidc259103399-2a546d96-7c8b-4a15-9df5-090f9b7ae460-2'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] SyncCollections->SaveCollection(): Data of folder 'Ud4d68' changed
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->SetState() written 1 bytes on file: '/var/lib/z-push/9/9/androidc259103399-2a546d96-7c8b-4a15-9df5-090f9b7ae460-fd'
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Folders>
13/11/2018 13:00:19 [ 2643] [WBXML] [test] O </Synchronize>
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] WBXMLEncoder->endTag() WBXML output completed
13/11/2018 13:00:19 [ 2643] [WBXML] [test] WBXML-OUT: AwFqAEVcT0sDezJhNTQ2ZDk2LTdjOGItNGExNS05ZGY1LTA5MGY5YjdhZTQ2MH0yAAFSA1VkNGQ2OAABTgMxAAFWR00DVWQ0ZDY4OmQzY2ViYjRiMzU1ODQ4ZDU4OTk2OWZmMjA0NDBiNmVlOGU0MTAwMDAwMDAwAAFdAARRAzIwMTgxMTEzVDExNTgzOVoAAWcDMjAxODExMTJUMjMwMDAwWgABZgN0ZXN0AAFoA2QzY2ViYjRiMzU1ODQ4ZDU4OTk2OWZmMjA0NDBiNmVlOGU0MTAwMDAwMDAwAAFaA01heCBNdXN0ZXJtYW5uAAFZA3Rlc3RAc293ZWkuZGUAAVIDMjAxODExMTNUMjMwMDAwWgABZQMwAAFNAzAAAUYDMQABZAMxMDgwAAFYAzAAAQARSkYDMQABTAMwAAFLAwABAVYDMQABAQEBAQEB
13/11/2018 13:00:19 [ 2643] [WBXML] [test] WBXML-IN : AwFqAEVcT0sDezJhNTQ2ZDk2LTdjOGItNGExNS05ZGY1LTA5MGY5YjdhZTQ2MH0xAAFSA1VkNGQ2OAABHhNVAzEwAAFXWAM0AAEAEUVGAzEAAUcDMjAwMDAwAAEBAQEBAQ==
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->Save(): Device data changed
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] FileStateMachine->SetState() written 1 bytes on file: '/var/lib/z-push/9/9/androidc259103399-devicedata'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] DeviceManager->Save(): Device data saved
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] LoopDetection->ProcessLoopDetectionTerminate()
13/11/2018 13:00:19 [ 2643] [ INFO] [test] cmd='Sync' memory='2.58 MiB/2.00 MiB' time='0.07s' devType='Android' devId='androidc259103399' getUser='test' from='91.16.124.153' idle='0s' version='2.4.4+0-0' method='POST' httpcode='200'
13/11/2018 13:00:19 [ 2643] [DEBUG] [test] -------- End
FilterType is 4 (two weeks).
Standard sync for mails is 14 days at exchange client and I can change that (what I always do) to all. I can’t change that for the calendar.