We work with use a number of commercial software systems which we like and recommend.
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Bynari | Bynari supply a plugin to Outlook (Bynari Connector) which allows the storage of Outlook Calendar items, Tasks, Contacts, etc on an IMAP server. This provides centralised storage, and using shared folders, Exchange like sharing functionality via our IMAP server. |
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ChatterEmail | ChatterEmail is a powerful IMAP email client for Palm OS Treo based phones. With it you can continuously an efficiently monitor your mailbox from your phone. Because if supports the IDLE IMAP extension, you even get instant notifications when new email arrives. |
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FastCheck | FastCheck is a small Windows program that runs and sits in your notification tray. It'll let you know immediately when new emails arrive, and allow you to see the email headers and even jump straight to the web interface. It has many configuration options making it flexible for most usage scenarios. |