  The Bohr-Bohnenblust-Hille Theorem states that the width of the strip in the
complex plane on which an ordinary Dirichlet series $\sum_n a_n n^{-s}$
converges uniformly but not absolutely is less than or equal to 1/2, and this
estimate is optimal. Equivalently, the supremum of the absolute convergence
abscissas of all Dirichlet series in the Hardy space $\mathcal{H}_\infty$
equals 1/2. By a surprising fact of Bayart the same result holds true if
$\mathcal{H}_\infty$ is replaced by any Hardy space $\mathcal{H}_p$, $1 \le p <
\infty$, of Dirichlet series. For Dirichlet series with coefficients in a
Banach space $X$ the maximal width of Bohr's strips depend on the geometry of
$X$; Defant, Garc\'ia, Maestre and P\'erez-Garc\'ia proved that such maximal
width equal $1- 1/\ct(X)$, where $\ct(X)$ denotes the maximal cotype of $X$.
Equivalently, the supremum over the absolute convergence abscissas of all
Dirichlet series in the vector-valued Hardy space $\mathcal{H}_\infty(X)$
equals $1- 1/\ct(X)$. In this article we show that this result remains true if
$\mathcal{H}_\infty(X)$ is replaced by the larger class $\mathcal{H}_p(X)$, $1
\le p < \infty$.
