Does Outlook work on Vista or Windows 7?

Update: the following also applies to Windows 7.
Do not enable compatibility mode - this is not needed and will cause problems with any version of Outlook.

Outlook 2003 on Windows 7:
Naturally, Outlook 2007, the newest version of Outlook, works well on Vista and Windows7. (It also works great on Windows XP.) Outlook 2003 works well on Vista but there are a few problems with it on Windows 7 (see links above). Both of these versions are officially supported on Vista and Windows 7, so if any issues arise Microsoft will offer public hotfixes or include the fix in future Service Packs.
Outlook 2002, 2000, 98, and 97 are not supported on Vista. If you choose to install any of these applications you should expect errors and annoyances. The better known problems are listed below but there may be others I'm not aware of. These versions of Outlook are all long out of support and Microsoft will not release patches to fix any problems with these versions. Upgrading is highly recommended, or use the new Vista calendar and mail applications if you are unwilling or unable to upgrade.

Outlook 2002: It runs, but email account passwords are not saved. After you enter the password during the first email check, Outlook will remember it until you close down Outlook. This is because Outlook used the protected storage interfaces to store passwords and these are no longer supported in Vista. Unless Microsoft decides to create a publicly available hotfix to address this, you won't be able to save passwords. Outlook 2002 is outside of mainstream support so this is unlikely to happen as it's not a critical security hole.
OLAutoPW automates the Network Password Entry for POP3 and IMAP accounts in Outlook 2002/XP SP3 on Windows Vista/Windows 7.
You can use a Windows script program such as AutoIt to enter the password for you.
Note that when you enter the password, the Send and Receive that brought up the password dialog may fail but future send and receives will work. Leave Outlook open 24/7 to avoid entering it frequently.
Recurring calendar items may not open. This may be related to opening a single event in a series from the Day/Week/Month view. Open the event using any List view, such as Recurring Appointments (View, Current View, Recurring Appointments). It may also work to open the entire series from the Day/Week/Month view, I haven't tested it yet.

Outlook 2000: Now that the list of workarounds is growing, thanks to our readers, consult page Outlook 2000 on Vista & Win7.

Outlook 98: Like Outlook 2000, IMO mode will not work because of the missing wab.dll. I haven't tested it with Corporate mode yet, but I recommend using Vista's Mail and Calendar programs instead - Outlook 98 is just too insecure.
If you are unfamiliar with the difference between IMO and Corporate modes, see Choosing an Outlook 98 or Outlook 2000 Mode.

Outlook 97: Not yet tested. Because of the lack of features, buggyness and slowness, it's highly recommended you either upgrade or use Vista's Mail and Calendar instead.

Fonte: Outlook