When comparing New Moon vs Seamonkey, the Slant community recommends Seamonkey for most people. In the question“What are the best web browsers for Windows XP 32-bit and ReactOS?” Seamonkey is ranked 8th while New Moon is ranked 12th. The most important reason people chose Seamonkey is:
Seamonkey is more than just an e-mail client as it is a full featured web browser as well. This makes for a good app to use for those that dislike having many different apps on their devices as it is a bit like an all in one solution.
Specs
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Pros
Pro It runs well on Windows XP. I tested it, daily, for more than two years.
It is quite easy to upgrade to a new version. All you have to do is to replace the old file/version with the new file/version - extracted from an archive. All your settings are kept after upgrade.
Pro Not just an e-mail client
Seamonkey is more than just an e-mail client as it is a full featured web browser as well. This makes for a good app to use for those that dislike having many different apps on their devices as it is a bit like an all in one solution.
Pro Auto imports setting from Thunderbird
For those that would be making the switch from the Thunderbird e-mail client setup is quite easy with Seamonkey as it auto imports all previous Thunderbird settings.
Cons
Con Permanent CPU usage
Seamonkey permanently uses CPU (quite a few percents on a Intel i7). On a laptop this causes the fan to run (which make noise) and the battery to lasts less time.