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Start by checking if those users have Exchange Cached Mode enabled.
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Start by checking if those users have Exchange Cached Mode enabled.

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And you can't switch to cached? This will eliminate all lags for sure.
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And you can't switch to cached? This will eliminate all lags for sure.

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Alexei - No we cant switch to cached. Most of the users are thin clients (citrix) and we just dont have the server space to do it this way.
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Alexei - No we cant switch to cached. Most of the users are thin clients (citrix) and we just dont have the server space to do it this way.

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Any further comments on this?
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How do you even start to diagnose the problem here?<br />
<br />
Users frequently complain that outlook response can be very slow. Each time, no issues with mailbox, cas servers or load balances.<br />
<br />
Where to start?
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How do you even start to diagnose the problem here?

Users frequently complain that outlook response can be very slow. Each time, no issues with mailbox, cas servers or load balances.

Where to start?

Outlook - slow response (Exchange 2013)

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.