Software for collaboration between thousands of employees?

The challenge is to facilitate communication between people in the firm. There are 3 different firms, a total population of 1,000 people and different locations.
There are a lot of different departments, bosses, employees, etc.
need to do sort mail name@otdel.domain.com
as well as to raise a simple chat between all departments for quick communications. also needed to raise convenient for all phone directory with the integration of email and chat rooms.
Is there any ready solutions, or suggestions?
March 19th 20 at 09:10
2 answers
March 19th 20 at 09:12
need to do sort mail name@otdel.domain.com

phone book with integration to mail and chats

as well as to raise a simple chat between all departments for quick communications


MS Exchange + Cisco Jabber. Perfect.
and some new and trendy three-in-one solutions do not exist? for Linux - lauriane_Thiel78 commented on March 19th 20 at 09:15
@lauriane_Thiel78, well, something of type CRM Bitrix24, though it's not exactly and generally for fans of weird. - Treva.Larkin77 commented on March 19th 20 at 09:18
@lauriane_Thiel78, zimbra. At mc there is still a social network. - janis90 commented on March 19th 20 at 09:21
March 19th 20 at 09:14
For Windows - M$ Exchange, but it is not cheap and requires licenses for each connection + M$ Lynx (it also costs money)
For Linux - Zimbra. About integrated chat will not say anything, maybe they in effect have

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