This is not for me personally but for everyone searching this in a search engine, so this is a community wiki question.
This question is based on this answer in which he stands that Mozilla Thunderbird is a alternative for Outlook. While Thunderbird is great for SoHo I simply disagree that it's an alternative to Outlook at company level.
In fact I would say that there is no good open source alternative for Microsoft Outlook (+Exchange) which can be used to entirely replace Outlook company wide.
I would like to hear your opinions on the following questions:
- Is there such an open source PIM suite (+server) which can compete with Outlook (I can even be web-based, as long as it's hosted internally, so no Google Mail/etc.)?
- If there is one: Have you personal experience with using and/or migration? What are key points?
- If not, why is this missing?