I have a single account that has been giving me issues as far as syncing ready to migrate from Exchange 2013 to Office 365 goes.
the sync process has failed multiple times with numerous errors, however I now seem to be past this, but the sync process has been running for 2 days, currently sitting at just under 54,000 items. Besides the very slow progress, much slower than every other account, I am concerned about the size of the mailbox. Exchange says it is 545.23MB while the sync process says it has already synced 2.29GB. This is the only account in the batch so there is nothing else syncing, the user does not have an archive on the Exchange server so I am confused about where this extra 2GB of data is coming from and why it is taking so long.
Anybody have any ideas on this?