Installing Horde 5 and configuring it for Active Directory and Dovecot

I have been using Horde for quite some time as my Webmail solution. Unfortunately the Update from Horde 4 to Horde 5 always produced some issues on my system, so I decided to do a fresh install. My old Horde was a very simple Setup: It used the IMAP authentication of IMPĀ  to authenticate users against my Active Directory. While this certainly works, this time around I want to configure Horde to authenticate against my Active Directory directly. Additionally I wanted my to use my Active Directory as Global Address Book for Horde.

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