Not in first release (the one on floppy) Win 95. That came with "Internet News and Mail" which was a piece of pre-alpha code acquired from taking over Siemens irish software operations and released without ever going gold.
This formed the basis for Outlook(Express) but wasn't it itself.
Also, Win 1.0 doesn't have OU, Win 2.0 doesn't have OE, Win 3.0 doesn't have OE, Win 3.1 doesn't have OE, Win 3.11 doesn't have OE, WinNT 3.0 doesn't have OE, WinNT3.5 doesn't have OE, first release WinNT 4.0 doesn't have OE.
IE was also addon code for just about every install of Windows prior to WinNT4 release 2.
P.