Add2Exchange 8.11.163.154 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program is a product of OpenDoor Software®. The program belongs to Communication Tools. We recommend checking the downloaded files with any free antivirus. The most popular version among the software users is 8.1.
From the developer:
Sync calendar, contact and task items across mailboxes and public folders alike with this award-winning Exchange server add-on. Compatible with any mobile device that syncs with your mailbox. Create group calendars and shared contact lists. Up to unlimited numbers of folder pairs.
You may want to check out more software, such as MAPILab Share'n'Sync or QuickSender, which might be similar to Add2Exchange.