2022-01 Migrate from Exchange to Office 365 (sample)

Change

Initiator	Maurice Pasman
Description	Migration of the on-premise hosted Exchange environment to Microsoft managed Office 365
Rationale	Higher availability, lower maintenance costs

Impact

Personnel	L
Customers	L
Assets	We free up two servers

Risks

Mention any information security, privacy or other risks here.

Threat	Likelihood	Impact	Exposure	Treatment
Error when migrating mailboxes.	L	H	M	Formulate rollback plan

The exposure is expressed as a factor of the likelihood and impact.

Likelihood / Impact	High	Medium	Low
High	H	H	M
Medium	H	M	L
Low	M	L	L

Click here to see the definitions of likelihood and impact

Likelihood

Likelihood	Description	Frequency
Low	It is not likely to materialize It has never happened to organizations similar to ours	Less than once per year
Medium	It is likely to materialize It has happened to organizations similar to ours	Once or twice per year
High	It is very likely to materialize It has happened to our organization before	Multiple times per year

Impact

Impact	Description	Financial	Personal health	Reputation	Legal
Low	Some data or information is not accurate or available Small amounts of non-sensitive personal data leaked Small damage or consequences	Below € 10.000	One person experiences inconvenience	Incidental (local) media attention	A possible claim
Medium	Most data or information is not accurate or available Large amounts of non-sensitive personal data leaked Considerable damage or consequences	Between € 10.000 and € 50.000	Multiple persons experience inconvenience, one person suffers an injury	Incidental nationwide media attention or frequent local media attention	A lawsuit, multiple claims
High	Most or all data or information is not accurate or available Large amounts of sensitive personal data leaked Large damage or consequences for the continuity of the organization	Above € 50.000	Multiple persons suffer injuries, fatal consequences	Frequent nationwide media attention	Multiple lawsuits

Rollback plan

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