If you install mailenable pro then horde webmail will still work under webmail.domain.com unless you do the changes below.
Of course if you dont need the features of mailenable pro then no reason to install it, i think the most popular reason people use pro is so they can introduce virus scanning on the emails as they pass through.
To setup mailenable webmail for webmail.domain.com:
1. go to Computer Management -> Local Users and Groups
2. set password to user account IME_USER
3. go to IIS Manager
4. select site "webmail(default)"
5. open "webmail(default)" Properties dialog
6. go to tab Home Directory and set it to <MailEnable Path>\Bin\WebMail
7. go to tab Directory Security and set IME_USER as anonymous
8. create MEWebMail virtual directory for folder <MailEnable
Path>\Bin\WebMail under "webmail(default)"
if you want to logon as user/password (by default you must logon as
user@domain/password), you should replace line 133:
oLogin.UserName = Request("UserID")
in <MailEnable Path>\Bin\WebMail\base\default\lang\EN\login.asp with
UserID = Request("UserID")
If InStr(1,UserID,"@") = 0 Then
' user & hostname
SiteName = GetSiteName()
If InStr(1,LCase(SiteName),"webmail.") = 1 Then
UserID = UserID & "@" &
Right(SiteName,Len(SiteName)-Len("webmail."))
End If
End If
oLogin.UserName = UserID