Long ago Microsoft had MSN Messenger, which was one of the leading messaging apps. It worked well, and many 'normal' users were using it. Then Microsoft dissolved the team behind it and screwed up the product so bad with bloatware and ads that everyone moved to WhatsApp (except in the US where people went back to texting). Then Microsoft came out with Communicator, renamed it to Lync, which was a corporate messenger/…
They also bought (and ruined) MindAlign which had originally been developed and spun off from UBS investment bank and was light years ahead of its time. What they turned it into / replaced it with was such a depressing step backwards.
Interchange was a java client, that fundamentally spoke standard IRC to IRC servers, but also used extra external databases to auto-connect users to channels and secure sensitive channels. The client also forced real names (via Active Directory), and was hardcoded to only connect to the UBS IRC servers.
The IRC servers themselves were altered to only allow Interchange clients to connect[1] and to only allow approved bots in channels most of which did full chat logging for compliance purposes.
Interchange was so slow it was nicknamed 'Interchug'.
The IRC server network spanned the UBS WAN network globally, and all staff were encouraged to use it. For the era, no other large banking corporate had anything similar running (officially).
Source: I worked in UBS IT during this period.
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[1] Although the more enterprising of us just HEX edited mIRC to report the Interchange client name.