Office 365 Performance with XenApp 7.6 

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Instructions

Outlook 2013 supports running in Cached Exchange Mode in a Remote Desktop Services (Terminal Services) environment that has multiple users. When you configure a computer running RDS to use Cached Exchange Mode, be sure to consider the additional storage space and disk I/O that are required for multiple client access.
 
New Exchange accounts set up on computers running RDS use Online Mode by default. At setup, the user can decide to enable Cached Exchange Mode, or the user can control this setting by using the Use Cached Exchange Mode for new and existing Outlook profiles option in the Office Customization Tool or in Group Policy.
 
Our Option here is :
 At setup, the user can decide to enable Cached Exchange Mode, or the user can control this setting by using the Use Cached Exchange Mode for new and existing Outlook profiles option in the Office Customization Tool or in Group Policy.
 
 
If you  have storage limitation, you may try the following steps to check if this can improve the performance :
 
1. Disable hardware acceleration in Office365  (https://support.microsoft.com/en-au/kb/2768648)
 
Ensure no OST file being created or stored in user profile on network Disable ‘Reading Pane’ view Disable ‘Live Preview’
Manage ‘COM Add Ins’ and disable unnecessary add-in’s, if necessary
 
2. Enabling "Legacy graphics mode" by Citrix policy.
 

Office 365 Performance with XenApp 7.6

Reference : https://technet.microsoft.com/en-us/library/jj683103(v=office.15).aspx
                        http://www.microsoft.com/en-us/download/details.aspx?id=15238