Outlook for Mac 15.3 (Outlook 365) gets hung up on Sync Pending

Deleted the Exchange account and set up a new one, this sorted so far the "Sync pending for this folder" error. 

Prior and after setting up new exchange account, I get massive amount of "Sync Errors".

Downloading, permission, calendar events, recurring and old ones

2-3 error logs per minute

How can this problem be solved?

This has been an ongoing issue (from Version 15.3 forward) - since my upgrade to Version 15.6 the sync pending for this folder issue has gotten much much worse.   Seems to be getting worse over time as today it was almost non-stop restarting Outlook to get new email.

What is the status of a fix for this by Microsoft? 

mark

Still having this issue as well with 15.6, along with both my colleagues that are also using 15.6 (all on Yosemite, brand new Macbook Pro's). It seems that putting the laptop to sleep tends to trigger the issue. I also initially thought it might be tied to switching back and forth between a USB-based ethernet adapter and Wi-Fi, but I just tested it and doing so appeared to work fine.

Jason - I concur. I have no trouble so long as my MacBook stays "awake"--everything works great. As soon as it goes to sleep and then wakes, I get the "Sync pending" error and email ceases.

After deleting Exchange account and set of of new, main problems are:

1. "Sync pending error" came back after a few hours after. Now have to restart Outlook to sent mail or make sure i have received recent mails. 
2. "Sync errors" continues - 4 logs per minute
3. Categories in Exchange calendar events disappeared after setting up new exchange account. Cannot set or edit categories any more.

Cannot continue to use a Outlook 15.x for Mac - for business!