I installed Grommunio on my Synology ds918plus with 16GB RAM in the VMM as VM using the lastest ISO. I am currently running the getting old Kopano4s (Kopano docker adaptation for Synology). Installed GRO on my ds918p (where it will be used after updating the Synology from the old OS DSM6.x to DSM7x) as well as on my ds620s (which will hold the GRO installation and mailboxes for a week or so until the update of the ds918p ist finished).
Both installations are up and running. I can connect via IMAP. I can send and receive Emails. I was also able to transfer all my email using IMAP pushing all emails from my K4S exchange account to the new account using IMAP (copying the mails wasn't possible using Exchange). Last step was copying my contacts as well as my calendar from the productive exchange account to the newly setup Exchange account when I realized that I was able to copy all contacts as well as calendar to the new exchange account in my Outlook 2019. But nothing arrived in the GRO itself when I checked the mailbox using the web interface.
Is there any know bug that calendar and/or contacts are not synced from the Outlook client to the GRO database? I have the same issue on both machines. So that's really not a random issue. It happens on both machines at the same time.