[AirSync] Error in client/server conversion
The AirSync Error in client/server conversion usually means the email client has tried to sync a eg: “malformed or invalid item” (like an event or contact) that the server couldn’t process, or the server was temporarily unavailable.
So “apart from you going through your calendar events to look for any obvious errors or invalid characters etc”, you can “try clearing the local calendar cache” to resync your server events.
To clear the local calendar cache, you run the repair via “right clicking on the word Calendar” directly under your account and click “Properties” at the bottom. Then click the “Repair tab” at the top and finally click repair.
Note: Once the cache is cleared events etc will be slower to reread till fully cached again locally.
If that makes no difference then suggest next to go to “Menu / Accounts” and try removing and readding your account” (if you haven’t already tried that) and see if that fixes the problem.
Note: if you do try removing and readding your account, make a manual backup first via “Menu / Backup” incase you need to restore for any reason. You can see when that completed in “Show Operations” via the dropdown on the right of Refresh.
If removing and readding your account makes no difference then update what version of eM Client you are using and if you have Windows or Mac and OS version.