Outlook For Mac - emails slow to arrive

We have a rather odd issue with Outlook 2016 for mac whereby emails no longer arrive in a prompt manner. Our users are seeing a delay of upto 45mins before their new emails appear. We have 15 macs and 4 now have this issue.

Not only do our users complain profusely about this but also one of our clients has spotted the deterioration in our response time.

To our knowledge this issue started in late September so I'm thinking an update could well be the cause. Our users have not yet upgraded to El Capitan.

Has anyone else experienced this problem? Or perhaps has anyone got a fix for this problem? As usual there are a few posts on Technet and MSDN forums but no official response from Msft.

Many Thanks,
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Ankit PareekOnline MarketingCommented:
Hey you can do the following steps if your email arrive delay

From the Mail menu, click Preferences > Accounts > Mailbox Behaviors


Store draft messages on the server > leave unchecked


Store sent messages on the server > leave unchecked


Store junk messages on the server > checked Delete junk messages when > Never


Move deleted messages to the Trash mailbox > leave unchecked Store deleted messages on the server > leave unchecked
IDWilliamsAuthor Commented:
Thanks for the suggestion Ankit.

Sadly it wont work for us. We use Exchange accounts therefore those options are not available for Exchange accounts.
Etienne ErasmusCommented:
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What version of Exchange are you using? Here is an MS KB that describes a problem with Exchange 2010 servers that could cause your problem:  

IDWilliamsAuthor Commented:
Thanks for all the suggestions.

I am somewhat reluctant to start focusing on our exchange server when this is issue is clearly a Outlook for Mac thing. We have a total of 130 users spread across 3 different exchange servers. This issue is only happening on 2 out of the 3 servers and only affecting the mac users.

Do you have any suggestions relating to Outlook For Mac 2016?
Tim LapinComputer Consultant (Desktop analyst)Commented:
While you are correct to keep the primary focus on the client side, if there are indeed issues with some versions on the server side, it could not hurt to at least document the specs of your server.  That way you know what you are dealing with, at the very least.
IDWilliamsAuthor Commented:
Good point Tim I totally agree. I will also be giving our Exchange servers a once over. I have organised a weekend maintenance window in 2 weeks time to upgrade us to sp3 which could well fix the problem.

In the meantime I am v keen to hear any client side suggestions people have.
Tim LapinComputer Consultant (Desktop analyst)Commented:
Any luck in resolving your issue?

What were the results of assessing / upgrading your Exchange server?
IDWilliamsAuthor Commented:
It appears a Microsoft update for office 365 fixed this one, after several weeks we updated all the clients and this fixed the problem.

Thanks for all your suggestions.

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IDWilliamsAuthor Commented:
Waiting for a Microsoft Office update was the fix.
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