Comparison of Email Clients for Macs

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Feature/Client	Entourage	Mac Mail v10.5	Mac Mail v10.6	IMAP (Mac Mail, Thunderbird, etc)	Outlook Web Access (Webmail) - Firefox, Safari
Officially supported client for our e-mail server^^^	Y (v13)	N	N	N	Y
Does it stop working during major server upgrades	Y (v13 should be most resilient)	Y	Y (may be slightly more resilient)	Y	Y
Support for giving and using delegate permissions	Y	N	???	N	Y (cannot grant)
Public Folders	Y	N	N	N	Y
Global Address List (GAL)	Y	Partial	Partial	Via LDAP	Y
Single password for sending/receiving/GAL	Y	N	N	N	Y
Personal Distribution Groups	Only local	Only local	Local + Server (read-only)	Only Local	Y
Access to GAL off-campus without VPN	N	N	N	N	Y
Server-side Out of Office Reply	Y	N	N	N	Y
Exchange Address Book configured simultaneously with email account	Y	N	Y	N	Y
Check Names feature polls GAL	Y	N (by default)	Y	N	Y
Address Book stored on server	Y (default)	N	N	N	Y
Exchange Calendar configured simultaneously with email account	Y	N	N but easy to add	N	Y
Calendar stored on server	Y (default)	N	N but can be synced	N	Y
Support for Task Items to be stored on server	Y (default)	N	N	N	Y
Recover Deleted Items	N	N	N	N	Y
Can encrypt and read encrypted messages out of the box	Y	N	N	N	Internet Explorer Only
Rich Text Editing	Y	Y	Y	Y	Y
Drag and Drop	Y	Y	Y	Y	Y (except attaching files)
Full Message and Folder List in Navigation Bar	Y	Y	Y	Y	Y
Easily select multiple messages	Y	Y	Y	Y	Y
Delivery and read receipt out of the box	N	N	N	N	Y
Meeting Scheduling - Free/Busy Report	Y	N	N	N	Y
Speed	OK (better with v13)	Good	Good	???	Good-ish

^^^ Microsoft guarantees that this client will work with our e-mail server across upgrades. This is not guaranteed for any other client except Webmail.