Persistent pop up message

[cyberzork]

[AirSync] MailClient.Accounts.ConnectionException: Found invalid data while decoding.”

That error has been a random problem for some Outlook users. See @Olivia_Rust post link below.

Outlook error [AirSync] Synchronization error (SyncStateNotFound)

Recently, we have seen a lot of reports of Outlook calendar issues, the error usually looks like this: [AirSync] Synchronization error (SyncStateNotFound) In the log the error can also include details like Found invalid data while decoding. and Folder hierarchy changed. We are aware of this error but unfortunately had no luck replicating it yet or finding the real cause yet. The error usually means the server lost sync data for a particular device and account. That should normally happen o…

Also make sure you are using the latest version of eM Client via the release history page just incase you have an older / outdated version.

Ps For me personally with my own Outlook account, ive only ever seen that error twice randomly in 2 years and carn’t replicate it to send in for testing. But if you can replicate it, then there is an email address in the above Announcement link where you can then do testing if you are willing.