Method for managing communication processes (N1-N4) between internal participants (A, B, C) of an internal communication network on the one side and external participants on the other side, wherein the method takes place in the internal communication network and is characterized by the following steps: - Creation of a list in the internal communication network for the listing of incoming and outgoing communication processes (N1-N4) between the internal participants (A, B, C) and at least one external participant as a virtual mailbox, that is assigned to the at least one external participant, whereby the virtual mailbox for the at least one external participant is located, invisible and inaccessible, in an internal area of the internal communication network, in such a manner that the possibility of an internal coordination of the internal participants (A, B, C) is concealed towards the outside; - Recognition of a communication process (N1-N4) between at least one internal participant (A, B, C) and the at least one external participant as belonging to the at least one external participant on the basis of an identification that can be gathered from one of the communication processes (N1-N4) that is assignable the at least one external participant; - Storage, in the virtual post office, of every communication process (N1-N4) that was recognized as belonging to the external participant, whereby the internal communication network exhibits a server interface that is configured to mirror the incoming and outgoing communication process (N1, N2, N3, N4) in the virtual mailbox in such a manner that every communication process (N1, N2, N3) originating from an external participant is stored in both a mailbox (204, 210, 216) of an internal participant (A, B,C) as addressee of this communication process (N1, N2, N3), as well as also in the virtual mailbox, and every communication process that is directed from a mailbox (204, 210, 216) of an internal participant (A, B, C) to the external participant is both sent to the at least one external participant as well as also stored in the virtual mailbox; - Disclosure of the virtual mailbox for at least one selected internal participant (A, B, C) in such a manner that the at least one internal participant sees a communication process (N2, N3) that is incoming from the external participant to the other internal participant (B, C) and can then coordinate with the other internal participants (B, C). - Creation of a list in the internal communication network for the listing of incoming and outgoing communication processes (N1-N4) between the internal participants (A, B, C) and at least one external participant as a virtual mailbox, that is assigned to the at least one external participant, whereby the virtual mailbox for the at least one external participant is located, invisible and inaccessible, in an internal area of the internal communication network, in such a manner that the possibility of an internal coordination of the internal participants (A, B, C) is concealed towards the outside; - Recognition of a communication process (N1-N4) between at least one internal participant (A, B, C) and the at least one external participant as belonging to the at least one external participant on the basis of an identification that can be gathered from one of the communication processes (N1-N4) that is assignable the at least one external participant; - Storage, in the virtual post office, of every communication process (N1-N4) that was recognized as belonging to the external participant, whereby the internal communication network exhibits a server interface that is configured to mirror the incoming and outgoing communication process (N1, N2, N3, N4) in the virtual mailbox in such a manner that every communication process (N1, N2, N3) originating from an external participant is stored in both a mailbox (204, 210, 216) of an internal participant (A, B,C) as addressee of this communication process (N1, N2, N3), as well as also in the virtual mailbox, and every communication process that is directed from a mailbox (204, 210, 216) of an internal participant (A, B, C) to the external participant is both sent to the at least one external participant as well as also stored in the virtual mailbox; - Disclosure of the virtual mailbox for at least one selected internal participant (A, B, C) in such a manner that the at least one internal participant sees a communication process (N2, N3) that is incoming from the external participant to the other internal participant (B, C) and can then coordinate with the other internal participants (B, C).