What is the latest Skype for Business User-Agent string?

When using a client other than Skype for Business (formerly known as Lync) to connect with your Office 365 account, you’ll need to provide the Microsoft Lync servers with a user-agent string they recognize as an “acceptable” client. The reasoning behind this is surely to give you the best possible experience and not at all to lock out other messaging clients.

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Pidgin-sipe failed to authenticate to server while connecting to Office 365

For the last few days, an increasing number of Pidgin-sipe users have been rejected while trying to connect to their Office 365 accounts.
According to the SIPE developers, Lync servers (Office 365) have started rejecting the RC4 stream cipher. Even though it breaks the SIPE plugin, this could be seen as an improvement as Microsoft has recommended to retire RC4 as used in their TLS implementations for years.

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